Kong takes more time to stream the data through grpc

Hello,
I am using the grpc to stream the data from client to server.

When I stream a 1GB file without kong it takes 10 sec. However, the same task would take 45 sec if I proxy it through kong. The memory and CPU utilization of the ec2 instance where kong is running is not more than 10 %.
Can I optimise the performance with kong?

Thanks